Determine the size of the plywood substrate by measuring across the top of the cabinets. The finished top should overhang the drawer fronts by at least 1⁄4". Be sure to account for the thickness of the cementboard, adhesive, and tile when deciding how large to make the overhang. Cut the substrate to size from ¾" plywood using a circular saw. Also make any cutouts for sinks and other fixtures.
Set the plywood substrate on top of the cabinets, and attach it with screws driven through the cabinet corner
brackets. The screws should not be long enough to go through the top of the substrate.
Cut pieces of cementboard to size, then mark and make the cutout for the sink. Dry-fit them on the plywood
core with the rough sides of the panels facing up. Leave a 1⁄8" gap between the cementboard sheets and a 1⁄4" gap along the perimeter.
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